The phrase "party cohesion" refers to how unified and connected members of a political party are. It means that party members generally agree with each other and work together towards common goals. Full definition
Labour is clearly not immune from internal disagreement on Brexit; however, there is normally a high degree of party cohesion amongst the party groups in the Lords. (democraticaudit.com)
He said, «We call on Asiwaju Ahmed Bola Tinubu to either leave the APC, (or) curtail his greed (and) toe the line and exhibit the kind of loyalty needed for party cohesion whether from ordinary members or national leaders. (punchng.com)